Pulley.



R. H. BOWEN.

PULLBY.

APPLICATION FILED AUG. 28, 1912 Patented Jan. 1%, 1915.

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THE NORRIS PETERS (to PHOTD'LI7H0" WASHINGI'ON, v c

R. H. BOWEN.

PULLEY. APPLICATION FILED AUG. 28, 1912.

1,125,643, Patented Jan.19,1915.

4 SHEETS-SHEET 2.

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PULLEY.

APPLICATION FILED AUG. 28, 1912.

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Imwtw THE NORRIS PETERS C0 PHOTO-LITHO. WASHING mu n m R. H. BOWEN.

PULLBY.

APPLICATION FILED AU Patented Jan. 19, 1915.

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d mer-new THE NORRIS PETERS 60., PHDTOLITHO \VASHINGIGN D C.

RUSSELL n. BowEn,

0F PHILADELPHIA, PENNSYLVANIA, ASSIGN OR TO THE AMERI- CAN PULLEYCOMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

Specification of Letters Patent.

PULLEY.

Patented Jan. 19, 1915.

Application filed August 28, 1912. Serial No. 717,415.

To all whom it may concern:

Be it known that I, RUSSELL H. BOWEN, of Philadelphia, in the county ofPhiladelphia and State offPennsylvania, have 1nvented certain new anduseful Improve ments in Pulleys, whereof the following is aspecification, reference being had to the accompanying drawings.

My invention relates to so-calledspllt pulleys of the type which areprovlded w1th what maybe considered as a single diametrical spoke, saidspoke being however a two-part element, one part thereof being locatedwithin each half of the pulley. Th1s diametrical spoke element, in such.structures, constitutes the means of securlng the two halves of thepulley together and also the means for securing the pulley to the shaft;hence, for convenience of description, I shall term the said device, aclampmgspoke, and shall refer to each half thereof as a clamping-spokemember.

' In the accompanying drawings, Figure I, represents a side elevation ofa pulley embodying my invention, in one of its forms. Fig. II, is avertical axial section thereof, on the line II, II, of Fig. I. Fig. III,1s a vertical section thereof, at right angles to the axis, and on themedian plane of the pulley, as indicated by the line III, III, mFlg. II.Fig. IV, is a perspective view of one of the clamping-spoke membersemployed 1n said form, by which the two parts of the pulley aredetachably secured to one another and to the shaft. Figs. V, to X, bothinclus ve, represent another form of my invention, Fig. V, being a sideelevation, Fig. VI, a vertical section on the line VI, VI, of Fig. V,Fig. VII a vertical section on the line VII, VII, of Fig. V, and Fig.VIII, a longi- .tudinal central section through the clamping-spokemember employed in said form; Fig. IX, is a perspective View of saidclamping-spoke member, and Fig. X, a v1ew in perspective of one of thesocket pieces, or nut-holding devices, which are used in connectiontherewith.

Referring to Figs. I, to IV, of the drawings, 1, and 2, represent thetwo half-portions of the pulley, whose rim segments abut against oneanother, meeting upon the plane indicated at 3, 8. As the respectiveelements of the two half portions of the pulley are similar, (thepositions of certain of the parts being merely reversed), it will besufficient to set forth in detail only those parts which are comprisedin one-half portion, the corresponding parts in the other half not heingdescribed, but being indicated by simi- 7 ar numerals raised by onehundred, thus for instance, the part marked 4c, in one half 1pofftion,is indicated by 104, in the other 1a v The rim portion comprises asegmental flat band 4, having fillets 5, and 6, respectively, along itslongitudinal sides, said fillets being preferably made of sufficientdimensions to afford a considerable degree of stiffness to the rim. Anaperture 7, is formed in the rim at a point adjacent to the screw headof one of the securing devices for the clamping-spoke member about to bedescribed. Th1s clamping-spoke member is shown in perspective in Fig.IV, and comprises a central arched portion, or hub-clamp 10, havinglaterally projecting spoke portions, the general plane of whose edges11, and 12, is substantially parallel to the diametrical plane on whichthe pulley is split, but whose central portions are offset, or raised,as indicated at 13, and 14, respectively, the side walls of said offsetsconstituting extended rigid abutments located upon each side of thearched portion 10. In the ofiset portion 14, an inwardly dished recess17, preferably of square outline is formed, so as to receive the squarenut 18, of the screw bolt 20, and retain said-nut against turning. Ahole 21, is formed in the other offset portion 13, to permit the passageof a similar screw bolt 22. The position of these bolts is reversed, asshown in Figs. I, and III, so that the individual parts of therespective clampingspoke members may be made identical. At eachextremity the spoke-portion is bent abruptly to form an inwardprojection nearly at right angles to the general plane thereof, but witha contour adapted to fit snugly within the curved inner surface of therim, and preferably rounded in conformity therewith, as indicated at 15,and 16. These inward projections are relatively deep, extendingsubstantially beyond the terminals of the arc subtended by the archedhub-clamp portion, so that when the edges of the projections upon thetwo opposing spoke members meet, the spoke-portions will be separatedfrom one another by a conin Figs. V, to

siderable distance, asshown in thedrawings. The inwardly turnedextremities of the clamping-spoke member are provided with lugs 25, 26,and correlative recesses 27, and 28. The edge 29, of the lug 26, whichis nearest the observer in Fig. IV, is convex, or outwardly rounded, (asshown more clearly in certain of the dotted lines in Fig. II), so thatwhen applied within the corresponding recess 27, upon the otherclamping-spoke member, the ends of the pair meet symmetrically, asindicated by said dotted lines of Fig. II.

Holes 30, are formed in the inwardly projecting end portions of theclamping-spoke member, to receive the rivets 31, whereby said member issecured at each end to the rim portion at points immediately adjacent tothe ends of the latter. Within the arched portion 10, is mounted thehub-shell segment 33, which is secured in position by means of therivets 34. The two clamping-spoke members, carrying their-respectivehub-shell segments and rim segments, are secured together, and to theshaft, by-means of the screw bolts 20, and 22, applied at the rigidabutments, the organization permitting'the structure tobe formed of aminimum number of parts, since the several elements in one-half of thepulley are identical with those which fulfil similar functions in theother half. It will thus be seen that the clamping-spoke memberpossesses certain peculiar structural features, viz: the arched middlepart, or hub-portion 10, is relatively more pliable and resilient, thanthe lateral extensions, or spoke-portions 13, and 14, "which are highlyrigid, owing to the raised walls of the offsets. The projections at theextremities of the spoke-portions are also highly rigid as against theclamping pressure. Hence, when the-two halves of the pulley are clampedtogether upon a shaft, the clamping bolts are applied upon regions whichafford practically rigid abutments, and which do not yield to anysubstantial extent under pressure, while the intermediate archedportions, carrying the hubshells, have more pliability, which enablesthem to yield and closely embrace the shaft. Referring now to the typeof device shown X, it is unnecessary to describe in detail the rimsegments and other parts common to both embodiments of the invention, asthe difference lies chiefly in the form of the clamping-spoke member andmeans of holding the bolt nuts. The clamping-spoke member in thisinstance comprises the central arched part or hub-portion 50, having thelaterallyrprojecting spoke-portions 51, and 52, whose general plane isparallel to the plane of division of the pulley. A central raised offset53, extends throughout -the entire length of the clamping-spoke member,but'the side walls of said ofli'set at right angles to forming ofi'setwalls as shown at 57, and 58,

may advantageously :be made somewhat deeper at the spoke-portions thanat the hubportion, as indicated respectively at 55 and 56, in Figs.VIII, and IX. The lateral edges of the spoke-portion are bent or offsetthe general plane thereof,

while the edges of the hub-portion are unlianged and similar to thegeneral contour of the parts on each-side of the central oft' set wallsas shown at 59, and 60. Bolt holes 61, 62 are formed in the fiat partsof the spoke-portion to receive the bolts 63, 64. The nuts 65, 66, ofsaid bolts are received within the socket-piece 67, whose details areshown in Fig. X, and which comprises two square end-boxes 68, and 69,connected by a central bridge 70, whose extremities 71, and 72, are bentabruptly downward in substantial correspondencewith the contour of theside walls of the offset 53, in the spoke-portions. The socket piece67', is secured to the ofi'set .53, of spoke-portion by means of a rivet73,'which passes through the hole 74, and thenuts 65, and 66,'are heldagainst rotation, or displacement, by means of the inclosure thusformed. The extremities 7 5, and 76, ofthe clamping-spoke member arebent .inwardlyto form abutting projections whose endsare provided withlugs and recesses, as inthe former instance, and the devices are appliedto-thehub, and rim in the manner previously described. In thisembodiment it will benoted that while the hub-portion is somewhatlessresilient, or yielding, thanin the other type, by reason of the.additional stiffness afforded by the continuation of the offset 53,across the arch, yet the spoke-portions are relatively of much greater'rigiditythan said hub-portion, since the hub-portion lacks the offsetwalls like 57, and 58,-and moreover the walls of the offset 53, arepreferably deeper at the regions of the spoke portions than at thehub-portion. Hence the. general results and characteristic functions ofthe parts are substantially similar in both types.

I am aware. that it is not new to construct split pulleys in which eachhalf is provided with a spoke arm having a central arched portion withlateralextensions, and I do not broadly claimsuch construction. But, sofar as I am .aware, previous devices of this general character havefailed to obtain the localized high rigidity, in the spoke-portions,especially at the region of application of the clamping devices thereto,and at the meeting ends thereof, and the relatively greater pliabilityat the region of the hubclamp portion, which factors are the importantones characteristic of my invention.

By'my invention I am enabled to avoid the use of separable and distinctadjunctive devices intended to afford different degrees of resiliency'or'pliability.

Having thus described my invention, I claim:

1. In a split pulley, the combination of, a pair of rim segments; a pairof clamping spoke members, each comprising an arched tion adapted toafford substantial pliability with relation to the rigidity to the spokeportion; the extremities of said'spoke portions being provided withinwardly turned proiections whose depth substantially eX- ceeds theterminals of the arc subtended by the hub portion, said projectionshaving a contour adapted to fit snugly within the rim segment adjacentto the extremities thereof; and clamping devices having bearing surfaceswhich abut against the rigid portions of said clamping spoke members,substantially as set forth. 7

2. In a split pulley, the combination of, a pair of rim segments; a pairof clamping Copies of this patent may be obtained for five cents each,by addressing the spoke members, each comprising an arched longitudinalcentral hub portion and laterally extended spoke portions at theopposite ends of the hub portion and integral therewith, said spokeportions having a cross section adapted to afford substantial rigidity,and saidhub portion having a cross section adapted to afford substantialpliability with relation to the rigidity to the spoke portion; theextremities of said spoke portions being provided with inwardly turnedprojections having a contour adapted to fit snugly within the rimsegment adjacent to the extremities thereof, said projections beingtheir meeting edges, with alternating registering lugs and recesses; andclamping devices having bearing surfaces which abut against the rigidportions of said clamping spoke members, substantially as set forth.

In testimony whereof, I have hereunto signed by name at Philadelphia,Pennsylvania, this 23rd day of August 1912.

RUSSELL H. BOWEN. WVitnesses:

JAMES H. BELL, E. L. FULLERTON.

Commissioner of Patents,

Washington, D. 0.

provided, at 1

